Pump suggestions (1 Viewer)

[incysor]

I'm looking for suggestions for a new external pump. It needs to be very quiet, and handle about 12ft of head pressure a bit better than a mag 18. The pump will act as the return for my 75 and a 40 cube. I'll control the flow to each tank via ball valves, so the pump needs to be able to handle a certain amount of back pressure. The 18 is just a little bit under powered for my system, so the new pump doesn't need to be a huge power boost over the 18, I'm mainly trying to get the extra heat from the 18 out of the system. I was looking at the amp master 2100, but I'm not so sure after reading a couple threads on RC where people had issues with them leaking, and not being nearly as energy efficient as advertised.

Thanks in advance,

Brian

 

[Guest]

A Mag18 only puts out 700 gph at 12' of head. Are you just trying to get a little better than that, or are you trying to get close to the 1800 gph the Mag 18 promises?

If you just want to do a little better than the Mag 18, then you might want to look at something in the range of the Iwaki 55-RLT or even a 70-RLT. At 12' of head, the 55 will still give you about 900 gph. Mak4's will also flow well at that load, but none of these pumps are particularly quiet.

If you are looking for more flow, an Ampmaster or Sequence pump would give you that flow at 12' of head, and they are very quiet, BUT - you have to have at least 1.5"-2" plumbing in your system.

 

[incysor]

A Mag18 only puts out 700 gph at 12' of head. Are you just trying to get a little better than that, or are you trying to get close to the 1800 gph the Mag 18 promises?

If you just want to do a little better than the Mag 18, then you might want to look at something in the range of the Iwaki 55-RLT or even a 70-RLT. At 12' of head, the 55 will still give you about 900 gph. Mak4's will also flow well at that load, but none of these pumps are particularly quiet.

If you are looking for more flow, an Ampmaster or Sequence pump would give you that flow at 12' of head, and they are very quiet, BUT - you have to have at least 1.5"-2" plumbing in your system.

I've got 1" pipe running into both tanks. There's approx 4 ft of height on each tank, but with the connections there are several 90 degree angles cutting down on the flow to the 40gal especially. The line to the 75gal will hopefully be a straight shot with the T in the line heading off to the 40gal.I'd like to get a pump that I can get appox 500 gph into each tank, and use the ball valves to kind of balance it out, which I assume means there would be some back pressure on the pump.

 

[Guest]

By any chance are you coming to the meeting tonight? Your setup would make a great example on calculating flow rates.

 

[incysor]

I'm not going to be able to make it this evening unfortunately. I've got to work late tonight.

 

[Guest]

An Iwaki 55 would probably do the trick, if you plumb efficiently. For that matter, if you fix your plumbing, you could keep the Mag18 and get plenty of flow out of it.

The main thing you should change is to move up to 1.5" pipe between your sump and the pump, and from the pump to where you tee off to go to each tank. That main trunk line needs to carry ~1000-1200 gph, which is a lot of friction loss with 1" plumbing. Once you split it to go to each tank, 1" plumbing is fine since we're only talking about 500 gph. I you have a long run to the 40g tank and a bunch of elbows, it wouldn't hurt to bump that pipe up to 1 1/4" - the more the pipe is oversized for your flow rate, the less the elbows are going to slow you down.

Do all that, and you can probably reduce your head pressure to more like 6-8', which is a breeze for most pumps.

 

[rhane71]

I have an extra Iwaki MD100RLT that I am no longer using. I will sell it to you for $250. It pumps up to 39 FT. of head. I have one on my 200 set up as a closed loop. It puts out alot of flow. Look them up online if you want more on the specs. If your interested give me a call. I will be home all day. thanks..

Abran
281-860-0147

 

[incysor]

I have an extra Iwaki MD100RLT that I am no longer using. I will sell it to you for $250. It pumps up to 39 FT. of head. I have one on my 200 set up as a closed loop. It puts out alot of flow. Look them up online if you want more on the specs. If your interested give me a call. I will be home all day. thanks..

Abran
281-860-0147

I appreciate the offer, but I think this pump would probably be overkill on my system.

B

 

[incysor]

An Iwaki 55 would probably do the trick, if you plumb efficiently. For that matter, if you fix your plumbing, you could keep the Mag18 and get plenty of flow out of it.

The main thing you should change is to move up to 1.5" pipe between your sump and the pump, and from the pump to where you tee off to go to each tank. That main trunk line needs to carry ~1000-1200 gph, which is a lot of friction loss with 1" plumbing. Once you split it to go to each tank, 1" plumbing is fine since we're only talking about 500 gph. I you have a long run to the 40g tank and a bunch of elbows, it wouldn't hurt to bump that pipe up to 1 1/4" - the more the pipe is oversized for your flow rate, the less the elbows are going to slow you down.

Do all that, and you can probably reduce your head pressure to more like 6-8', which is a breeze for most pumps.

Unfortunately replumbing isn't really an option. Even if I used 1.25 or 1.5inch pipe it would only have a couple inches at that size at the most from the outlet of the pump to the bottom of my existing plumbing.

I'll do some reading on the iwaki 55 rlt.

Thanks for the suggestion.

Brian